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No, you do not need to trade to fill up the Sinnoh Dex if you're just looking for ones that are recorded as being "seen" in Platinum because all 210 Pokémon in the Sinnoh Dex can be recorded as being "seen" in Platinum however you do need to trade if you want to fill up your National Dex cause some Pokémon like Stunky or Glameow are only available in Diamond and Pearl. You must trade them to Platinum to record them as "obtained" in your National PokéDex.
What else can I help you with?
Who do you catch in Pokemon Platinum?
You catch Garatina, Dialga,Palkiia,and all the lake Pokemon but mainly Garatina
How do you catch thunderus in Pokemon Platinum'?
You can't get Thunderus in Pokemon Platinum at all. By then when Pokemon Platinum was made, no one knew that Pokemon Black and White were going to be made.
How do you find all the Pokemon in Pokemon platinum version?
Cheat, trade, migrate, catch
How do you find all legendary Pokemon in platinum?
Just catch them,you dummy!
What happens when you catch all of the unknown in Pokemon diamond?
I dont know what happen in diamond, but in platinum you can catch ! and ? unowns.
How do you complete the Sinnoh pokekdex in platinum?
You have to see all Pokemon Pokemon. But not the ones on nationaldex.
How do you get the nationaldex in Pokemon Platinum?
find all 210 Pokemon on sinnoh pokedex then visit profeser rowan
How many Pokemon do you have to catch to get a nationaldex in Pokemon ruby?
you don't need to catch them just see all the Pokemon in the hoenn pokedex
How do you catch all the Pokemon on platinum?
You can catch Sinnoh Pokemon in Pokemon platinum, but you need to migrate and trade unless you have an action replay
How do you get all the unkowns on Pokemon platinum?
You catch them.
Can someone tell you were to catch all Pokemon on Pokemon pearl because you need a complete nationaldex all caught?
yes the sister of dawn in sandgem city but she will tell you one Pokemon a day
Pokemon Platinum catch all Pokemon?
To finish the sinnoh dex (Pokemon platinum's,diamond, and pearl dex) you just need to see every Pokemon not catch every Pokemon.
Pokémon can you catch in platinum in Pokémon platinum?
You can catch and find all the sinnoh Pokemon and when you see all the sinnoh Pokemon you get the national dex and find and catch all the pokeradar Pokemon.You get the pokeradar when you get the national dex.
Who do you catch in Pokemon Platinum?
You catch Garatina, Dialga,Palkiia,and all the lake Pokemon but mainly Garatina
Pokemon ruby what you get after seeing all the Pokemon?
You get the diploma from catching all Pokemon from Nationaldex and Hoenndex.
How do you catch thunderus in Pokemon Platinum'?
You can't get Thunderus in Pokemon Platinum at all. By then when Pokemon Platinum was made, no one knew that Pokemon Black and White were going to be made.
In Pokemon platinum what Pokemon can you catch after getting national dex?
depending on where you go and what you do you can catch all of them, every Pokemon in existence
